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contestada

which set of side lengths can be used to construct a triangle?
A. 1, 2, 3
B. 6, 9, 15
C. 7, 12, 20
D. 9, 12, 17

Respuesta :

crisforp

Answer:

We verify: a < b + c; b < a + c; c < a + b;

Only a = 9, b = 12, c = 7  verify the conditions: 9 < 19; 12 < 16; 7 < 21;

The correct answer is D.

Step-by-step explanation: